| Article | |
| Report number | arXiv:1809.02873 ; CERN-EP-2018-246 |
| Title | First observation and study of the $K^{\pm} \to \pi^{\pm} \pi^{0} e^{+} e^{-}$ decay |
| Author(s) |
Batley, J.R. (Cambridge U.) ; Kalmus, G. (Cambridge U.) ; Lazzeroni, C. (Cambridge U.) ; Munday, D.J. (Cambridge U.) ; Slater, M.W. (Cambridge U.) ; Wotton, S.A. (Cambridge U.) ; Arcidiacono, R. (CERN) ; Bocquet, G. (CERN) ; Cabibbo, N. (CERN) ; Ceccucci, A. (CERN) ; Cundy, D. (CERN) ; Falaleev, V. (CERN) ; Fidecaro, M. (CERN) ; Gatignon, L. (CERN) ; Gonidec, A. (CERN) ; Kubischta, W. (CERN) ; Maier, A. (CERN) ; Norton, A. (CERN) ; Patel, M. (CERN) ; Peters, A. (CERN) ; Balev, S. (Dubna, JINR) ; Frabetti, P.L. (Dubna, JINR) ; Gersabeck, E. (Dubna, JINR) ; Goudzovski, E. (Dubna, JINR) ; Hristov, P. (Dubna, JINR) ; Kekelidze, V. (Dubna, JINR) ; Kozhuharov, V. (Dubna, JINR) ; Litov, L. (Dubna, JINR) ; Madigozhin, D. (Dubna, JINR) ; Misheva, M. (Dubna, JINR) ; Molokanova, N. (Dubna, JINR) ; Polenkevich, I. (Dubna, JINR) ; Potrebenikov, Yu. (Dubna, JINR) ; Stoynev, S. (Dubna, JINR) ; Zinchenko, A. (Dubna, JINR) ; Monnier, E. (Chicago U., EFI) ; Swallow, E. (Chicago U., EFI) ; Winston, R. (Chicago U., EFI) ; Rubin, P. (Edinburgh U.) ; Walker, A. (Edinburgh U.) ; Dalpiaz, P. (Ferrara U. ; INFN, Ferrara) ; Damiani, C. (Ferrara U. ; INFN, Ferrara) ; Fiorini, M. (Ferrara U. ; INFN, Ferrara) ; Martini, M. (Ferrara U. ; INFN, Ferrara) ; Petrucci, F. (Ferrara U. ; INFN, Ferrara) ; Savrié, M. (Ferrara U. ; INFN, Ferrara) ; Scarpa, M. (Ferrara U. ; INFN, Ferrara) ; Wahl, H. (Ferrara U. ; INFN, Ferrara) ; Baldini, W. (INFN, Ferrara) ; Cotta Ramusino, A. (INFN, Ferrara) ; Gianoli, A. (INFN, Ferrara) ; Calvetti, M. (Florence U. ; INFN, Florence) ; Celeghini, E. (Florence U. ; INFN, Florence) ; Iacopini, E. (Florence U. ; INFN, Florence) ; Lenti, M. (Florence U. ; INFN, Florence) ; Ruggiero, G. (Florence U. ; INFN, Florence) ; Bizzeti, A. (INFN, Florence) ; Veltri, M. (INFN, Florence) ; Behler, M. (Mainz U., Inst. Phys.) ; Eppard, K. (Mainz U., Inst. Phys.) ; Hita-Hochgesand, M. (Mainz U., Inst. Phys.) ; Kleinknecht, K. (Mainz U., Inst. Phys.) ; Marouelli, P. (Mainz U., Inst. Phys.) ; Masetti, L. (Mainz U., Inst. Phys.) ; Moosbrugger, U. (Mainz U., Inst. Phys.) ; Morales Morales, C. (Mainz U., Inst. Phys.) ; Renk, B. (Mainz U., Inst. Phys.) ; Wache, M. (Mainz U., Inst. Phys.) ; Wanke, R. (Mainz U., Inst. Phys.) ; Winhart, A. (Mainz U., Inst. Phys.) ; Coward, D. (Northwestern U.) ; Dabrowski, A. (Northwestern U.) ; Fonseca Martin, T. (Northwestern U.) ; Shieh, M. (Northwestern U.) ; Szleper, M. (Northwestern U.) ; Velasco, M. (Northwestern U.) ; Wood, M.D. (Northwestern U.) ; Anzivino, G. (INFN, Perugia ; Perugia U.) ; Imbergamo, E. (INFN, Perugia ; Perugia U.) ; Nappi, A. (INFN, Perugia ; Perugia U.) ; Piccini, M. (INFN, Perugia ; Perugia U.) ; Raggi, M. (INFN, Perugia ; Perugia U.) ; Valdata-Nappi, M. (INFN, Perugia ; Perugia U.) ; Cenci, P. (INFN, Perugia) ; Pepe, M. (INFN, Perugia) ; Petrucci, M.C. (INFN, Perugia) ; Costantini, F. (INFN, Pisa ; Pisa U.) ; Doble, N. (INFN, Pisa ; Pisa U.) ; Fiorini, L. (INFN, Pisa ; Pisa U.) ; Giudici, S. (INFN, Pisa ; Pisa U.) ; Pierazzini, G. (INFN, Pisa ; Pisa U.) ; Sozzi, M. (INFN, Pisa ; Pisa U.) ; Venditti, S. (INFN, Pisa ; Pisa U.) ; Collazuol, G. (INFN, Pisa ; Pisa, Scuola Normale Superiore) ; DiLella, L. (INFN, Pisa ; Pisa, Scuola Normale Superiore) ; Lamanna, G. (INFN, Pisa ; Pisa, Scuola Normale Superiore) ; Mannelli, I. (INFN, Pisa ; Pisa, Scuola Normale Superiore) ; Michetti, A. (INFN, Pisa ; Pisa, Scuola Normale Superiore) ; Cerri, C. (INFN, Pisa) ; Fantechi, R. (INFN, Pisa) ; Bloch-Devaux, B. (IRFU, Saclay) ; Cheshkov, C. (IRFU, Saclay) ; Chèze, J.B. (IRFU, Saclay) ; De Beer, M. (IRFU, Saclay) ; Derré, J. (IRFU, Saclay) ; Marel, G. (IRFU, Saclay) ; Mazzucato, E. (IRFU, Saclay) ; Peyaud, B. (IRFU, Saclay) ; Vallage, B. (IRFU, Saclay) ; Holder, M. (Siegen U.) ; Ziolkowski, M. (Siegen U.) ; Bifani, S. (INFN, Turin ; Turin U.) ; Clemencic, M. (INFN, Turin ; Turin U.) ; Goy Lopez, S. (INFN, Turin ; Turin U.) ; Biino, C. (INFN, Turin) ; Cartiglia, N. (INFN, Turin) ; Marchetto, F. (INFN, Turin) ; Dibon, H. (Vienna, OAW) ; Jeitler, M. (Vienna, OAW) ; Markytan, M. (Vienna, OAW) ; Mikulec, I. (Vienna, OAW) ; Neuhofer, G. (Vienna, OAW) ; Widhalm, L. (Vienna, OAW) |
| Publication | 2019-01-10 |
| Imprint | 05 Sep 2018 |
| Number of pages | 10 |
| Note | 15 pages, 4 figures, 1 table |
| In: | Phys. Lett. B 788 (2019) 552-561 |
| DOI | 10.1016/j.physletb.2018.11.046 |
| Subject category | Particle Physics - Experiment ; hep-ex |
| Accelerator/Facility, Experiment | CERN SPS ; NA48-2 |
| Free keywords | QCD ; branching fraction ; CP violation ; rare decay ; conservation law tests ; experimental results ; rare decay, ; chiral perturbation theory ; CP and P violating asymmetry |
| Abstract | The NA48/2 experiment at CERN reports the first observation of the $K^\pm \to \pi^\pm \pi^0 e^+ e^-$ decay from an exposure of $1.7 \times 10^{11}$ charged kaon decays recorded in $2003-2004$. A sample of 4919 candidates with 4.9% background contamination allows the determination of the branching ratio in the full kinematic region, BR($K^\pm \to \pi^\pm \pi^0 e^+ e^-)=(4.24 \pm 0.14)\times10^{-6}$. The study of the kinematic space shows evidence for a structure dependent contribution in agreement with predictions based on chiral perturbation theory. Several P- and CP-violating asymmetries are also evaluated. |
| Copyright/License | publication: (License: CC-BY-4.0) Preprint: © 2018-2024 CERN (License: CC-BY-4.0) The Author(s) |
Corresponding record in: Inspire
Email contact: brigitte.bloch-devaux@cern.ch
Record created 2018-06-25, last modified 2023-08-03